Light Crusader is the last Genesis game developed by Treasure and is similar to Landstalker. You're David, a knight, and you have 6 dungeon floors to overcome. There are puzzles, combat, and healing items.
Pictured here is an interesting test room, listed in the level select as "Floor 7" Room 04. You're in the castle's throne room, but with only a cow and some stairs. The cow - get this - shoots fireballs and other projectiles at you. This is a "Beat Them!" room, and you can kill the cow. After killing it, it'll be flipped upside-down and release a lot of Fire element pickup, which will lag the game for a while. It also explodes when it dies, but the explosions don't end and their graphics are messed up.